| 陈宜辉,朱咏,黎美群,杨丕山,卢恕来.不同膨胀系数石膏模型材料对基托树脂力学性能的影响[J].口腔材料器械杂志,2015,24(2):74-78. |
| 不同膨胀系数石膏模型材料对基托树脂力学性能的影响 |
| Effects of plaster cast materials with different expansion coefficient on mechanical properties of denture base resin |
| 投稿时间：2014-08-09 修订日期：2015-01-27 |
| DOI：10.11752/j.kqcl.2015.02.04 |
| 中文关键词: 石膏 冲击强度 弯曲强度 弹性模量 硬度 膨胀系数 |
| 英文关键词:Die stone Impact strength Flexural strength Surface Hardness Expansion Coefficient |
| 基金项目:青岛市优秀卫生专业发展基金,青岛市科技局重点项目(11-2-3-2-(7)-nsh). |
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| 中文摘要: |
| 目的 研究不同膨胀系数石膏模型材料对基托树脂力学性能的影响。方法 采用高、中、低3 种不同膨胀系数的石膏模型材料包埋型盒, 分别制作树脂基托试件, 通过测量试件的冲击强度, 弯曲强度, 弹性模量和硬度, 分析树脂试件的力学性能, 用扫描电镜观察试件的表面及横断面结构。结果 ①高、中、低膨胀系数石膏模型材料制作试样的冲击强度分别为: (5.79 ±0.90)KJ · m-2、(7.21±0.16)KJ · m-2和(8.89±0.58)KJ · m-2；弯曲强度分别为: (71.03±2.23)MPa、(85.18±5.32)MPa 和(110.06±4.06)MPa；弯曲模量分别为: (2797±83)MPa、(2512±88)MPa 和(2088±42)MPa；硬度(洛氏)分别为: 16.30±0.35, 20.50±0.38, 26.80±0.14, 各组数据之间的差异具有显著的统计学意义(P<0.01)。扫描电镜观察发现: 高膨胀系数石膏制作的试样表面颗粒排列紊乱、孔隙较多, 横断面气泡较多, 结构疏松；低膨胀系数组的树脂试样表面颗粒排列整齐, 孔隙较少, 横断面气泡明显减少, 结构致密；中膨胀系数组的表现介于两者之间。结论 低膨胀系数石膏模型材料制作的树脂基托力学性能最佳。 |
| 英文摘要: |
| Objective To evaluate the influence of the plaster cast materials with different expansion coefficient on mechanical properties of denture base resin. Methods Three kinds of plaster cast materials with high, medium and low expansion coefficient were embedding in molding flask. 5 specimens with different dimension were made for measuring impact strength, flexural strength and flexural modulus and hardness. Moreover, the surface morphology and cross section structure was observed by scanning electron microscopy. Result The impact strength of plaster cast materials with high, medium and low expansion coefficient were respectively 5.79 ±0.90KJ·m-2, 7.21±0.16 KJ·m-2 and 8.89±0.58KJ·m-2. The flexural strength were respectively 71.03±2.23MPa, 85.18±5.32MPa and 110.06±4.06MPa; the flexural modulus were respectively 2797±83MPa, 2512±88MPa and 2088±42MPa；and the hardness was respectively 16.30±0.35，20.50±0.38，26.80±0.14MPa. There were statistically significant difference among three groups (P<0.01). Through scanning electron microscopy, we observed that the particles arranged in disorder and there was a lot of pore on the surface of the resin sample made with the high expansion coefficient gypsum, more bubble and loose structure was seen through cross-sectional scan. The particles on the surface of resin samples made with low expansion coefficient were neatly arranged and had less porosity, less bubble and dense structure through cross-sectional scan. The roughness and the density of the resin sample made with middle expansion coefficient gypsum was lower than the high expansion coefficient gypsum group and higher than the low expansion coefficient group. Conclusions Denture base resin made with low expansion coefficient gypsum have better mechanical properties. |
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